brightness details and to compute the selected values of mathe
matical expectation (ME), mean square deviation (MSD), spatial-
frequency spectrum and density and function of distribution of
these parameters for given objects or areas of terrain.
The rough schematic diagram of basic processes for solving
these problems is given in Pig. 2.
Conversion
Préparaitor
of photo
of initial
image into
data and
digital form
*»■
entering
them in
computer
Calculation
Statistical
of bright-
processing
ness cha-
of results
racteris-
of determi-
tics of
nation of
terrain
brightsness
elements
characteris-
tics
Pig. 2. Rough block diagram for determining and
statistical processing of terrain brightness
characteristics.
Conversion of the original negative (section of negative)
and sensitogram into digital form is perfomed with the aid of
the image input/output device (HOD) of, for instance, the
type "Colormation S-4500”. As a result, the matrix of values
of optical density and image elements, each measuring a x a
(usually 12.5 x 12.5, 25 x25, 50 x 50, 100 x 100 or 200 x
200 nm) is recorded on the magnetic tape.
For conversion of the initial matrix of the values of
optical density of the image into the matrices of original
brightness characteristics of terrain elements the necessary
initial data are entered into the computer.
1. Coordinates of reference points in the coordinate
systems of the digital image, picture and terrain required
for establishing relationships between these coordinate systems.
The coordinates of centers of sensitogram fields in the
HOD system used in computing the mathematical expectations
of the values of optical density of sensitogram fields.
